In this mode, the mobile phone will reduce some unnecessary energy consumption and extend the battery life, but it will limit the use of some functions. Specifically, when the battery charge is less than 20%, the mobile phone will prompt the user to charge; When the battery is lower than 10%, the mobile phone will pop up a low battery warning box; When the battery is less than 5%, the phone will automatically enter the low battery mode and the battery color will turn yellow. Low battery mode can prolong the use time of mobile phones, which is very practical for users who often need to go out or use their mobile phones for a long time. However, it should be noted that the low battery mode will limit the use of some functions, such as automatic screen locking, automatic synchronization and other functions may be disabled, and the performance of mobile phones and network connection speed will also be affected.